6811631 has 4 divisors (see below), whose sum is σ = 6881952. Its totient is φ = 6741312.

The previous prime is 6811627. The next prime is 6811639. The reversal of 6811631 is 1361186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6811631 - 2² = 6811627 is a prime.

It is a super-2 number, since 2×6811631² = 92796633760322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 6811631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6811639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35015 + ... + 35208.

It is an arithmetic number, because the mean of its divisors is an integer number (1720488).

Almost surely, 2^6811631 is an apocalyptic number.

6811631 is a deficient number, since it is larger than the sum of its proper divisors (70321).

6811631 is an equidigital number, since it uses as much as digits as its factorization.

6811631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70320.

The product of its digits is 864, while the sum is 26.

The square root of 6811631 is about 2609.9101517102. The cubic root of 6811631 is about 189.5616023503.

The spelling of 6811631 in words is "six million, eight hundred eleven thousand, six hundred thirty-one".